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# -*- coding: utf-8 -*-
#
# Copyright 2012 Manuel Quiñones
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
from gettext import gettext as _
import logging
import gtk
import cairo
# This prevents the expose callback to draw a large stroke each time:
STROKE_MAX_POINTS = 80
class Drawing(gtk.DrawingArea):
def __init__(self, parent):
super(Drawing, self).__init__()
# Communication with the activity, for sharing:
self._parent = parent
# This are temporal points stored while the stroke is being
# made. When the stroke is finished (release event) the
# stroke is applied to the canvas.
self._stroke_points = []
# Our drawing canvas:
self._drawing_canvas = None
# The settings of our brush:
self._settings = {
'stroke color': (1.0, 0.0, 0.0, 0.3),
'stroke width': 8,
}
# Sharing?
self.we_are_sharing = False
# The masks to capture the events we are interested in:
self.add_events(gtk.gdk.EXPOSURE_MASK | gtk.gdk.VISIBILITY_NOTIFY_MASK)
self.add_events(gtk.gdk.BUTTON_PRESS_MASK | \
gtk.gdk.BUTTON_RELEASE_MASK | \
gtk.gdk.BUTTON1_MOTION_MASK)
# Connect the callbacks:
self.connect("expose-event", self._expose_cb)
self.connect("button-press-event", self._press_cb)
self.connect("motion-notify-event", self._motion_cb)
self.connect("button-release-event", self._release_cb)
def setup(self, width, height):
"""Setup a blank canvas of specified size."""
logging.debug("drawing set up")
self._drawing_canvas = cairo.ImageSurface(cairo.FORMAT_ARGB32,
width, height)
context = cairo.Context(self._drawing_canvas)
context.rectangle(0, 0, width, height)
context.set_source_rgb(1.0, 1.0, 1.0)
context.fill()
self.queue_draw()
def set_sharing(self, share=True):
"""Set sharing True or False."""
self.we_are_sharing = share
def get_size(self):
"""Return the size of the current canvas."""
width = self._drawing_canvas.get_width()
height = self._drawing_canvas.get_height()
return width, height
def remote_stroke(self, stroke_points):
"""Draw stroke from other player."""
context = cairo.Context(self._drawing_canvas)
self._set_stroke_context(context)
self._paint_stroke(context, stroke_points)
self.queue_draw()
def clear_drawing_canvas(self):
width, height = self.get_size()
self.setup(width, height)
if self.we_are_sharing:
self._parent.send_new_drawing()
def _set_stroke_context(self, context):
"""Set the settings of our brush to the Cairo context."""
context.set_source_rgba(*self._settings['stroke color'])
context.set_line_width(self._settings['stroke width'])
def _paint_stroke(self, context, stroke_points):
"""Draw lines from the list of points to the Cairo context"""
point_x, point_y = stroke_points[0]
context.move_to(point_x, point_y)
for point_x, point_y in stroke_points[1:]:
context.line_to(point_x, point_y)
context.stroke()
def _send_stroke_to_drawing_canvas(self, continue_stroke=False):
"""Paint current stroke in the canvas, clean stroke points."""
# Return if there is no stroke to paint:
if self._stroke_points == []:
return
# Get context from canvas and paint:
context = cairo.Context(self._drawing_canvas)
self._set_stroke_context(context)
self._paint_stroke(context, self._stroke_points)
if self.we_are_sharing:
self._parent.send_stroke(self._stroke_points)
# Clean the list of points:
if continue_stroke:
self._stroke_points = self._stroke_points[-1:]
else:
self._stroke_points = []
def _press_cb(self, widget, event):
mouse_x, mouse_y, state = event.window.get_pointer()
# We paint pressing the BUTTON1, return otherwise:
if not state and gtk.gdk.BUTTON1_MASK:
return
self._stroke_points.append((mouse_x, mouse_y))
def _motion_cb(self, widget, event):
if event.is_hint:
mouse_x, mouse_y, state = event.window.get_pointer()
else:
mouse_x = event.x
mouse_y = event.y
state = event.state
# We paint pressing the BUTTON1, return otherwise:
if not state and gtk.gdk.BUTTON1_MASK:
return
# Paint stroke in canvas if it gets too big:
if len(self._stroke_points) > STROKE_MAX_POINTS:
self._send_stroke_to_drawing_canvas(continue_stroke=True)
self._stroke_points.append((mouse_x, mouse_y))
self.queue_draw()
def _release_cb(self, widget, event):
self._send_stroke_to_drawing_canvas()
def _expose_cb(self, widget, event):
context = self.window.cairo_create()
# Paint the canvas in the widget:
context.set_source_surface(self._drawing_canvas)
context.paint()
# Return if there is no stroke to paint:
if self._stroke_points == []:
return
# Get context from widget and paint:
self._set_stroke_context(context)
self._paint_stroke(context, self._stroke_points)
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